JPH0631755Y2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electronic device, and more particularly to a thin electronic device such as a card calculator and an electronic notebook.

<Prior Art> In recent years, in electronic equipment, in order to prevent the influence of static electricity and noise from the outside, a conductive member such as a metal plate is provided on the front and back of the equipment, and both are electrically connected and the inside is shielded. Was adopted.

This configuration has a problem in assembling thin electronic equipment because it uses thermal bonding, and if a force is applied in the thickness direction of the equipment, the pasted members may peel off or float up. There are problems and lack of certainty of connection.

Therefore, the structure shown in FIGS. 10 and 11 has been proposed.

In the figure, 15 is a front film, 16 is a back film, 17 is a key contact sheet (attached with a conductive thin film), 18 is a key spacer, 19 is a printed circuit board, and 20 is a cabinet.

In the case of FIG. 10, the key contact sheet 17 is connected to the printed circuit board 19 by thermal adhesion (the connection point is indicated by A), and the coil spring 23 attached to the printed circuit board 19 by solder 22 The printed circuit board 19 and the metal plate 24 are connected.

In the case of FIG. 11, a part of the key contact sheet 17 is extended to the back side of the cabinet 20 through a hole 21 provided in the cabinet 20, and a metal plate 25 is attached to the cabinet 20 so that the cabinet 20 and the metal are The key contact sheet 17 is sandwiched between the plates 25 to electrically connect the key contact sheet 17 and the metal plate 25. In addition, 26 is an adhesive tape.

<Problems to be solved by the device> In the conventional method, thermocompression bonding is expensive and leads to an increase in cost. Moreover, in the structure in which the front film and the metal plate provided on the back side are electrically connected, the thickness direction Since the pressure is applied to the metal plate, the metal plate or the attachment part of the cabinet of the printed circuit board is peeled off.

<Means for Solving Problems> The present invention provides a key contact sheet, a key spacer, and a printed board between the front film and the back film, and the outer frame is formed by the front film and the back film, the cabinet, and the metal plate. In the electronic device to be formed, a recess is formed in the cabinet, the metal plate located inside the cabinet is exposed in the recess, and one side surface of the recess is formed from the metal plate and mounted on the cabinet. The key contact sheet has a structure in which an extending part of the key contact sheet is bent in the recess, and an elastic member is inserted into the recess to press the metal plate and the extending part into contact with each other. .

<Operation> With the electronic device according to the present invention having such a configuration, since the biasing action of the elastic body acts in the lateral direction, regardless of the force applied to the metal plate, the printed circuit board, and the attachment part of the cabinet,
The adhesive material does not float or peel off.

<Embodiment> Hereinafter, the configuration of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of an electronic device according to an embodiment of the present invention.

In the figure, 1 is a front film, 2 is a back film, and a key contact sheet (film) is placed between both films 1 and 2.
3, a key spacer 4 and a printed circuit board 5 are provided, and an outer frame is formed by the front film 1 and the back film 2, the cabinet 6 and the metal plate 7.

An LSI chip 8 is mounted on the printed circuit board 5 in addition to a circuit pattern (not shown) being formed.
The LSI chip 8 is a computing element that performs computation in response to key input data.

A key top (key symbol) (not shown) is formed on the front film 1, and when the operator presses (operates) a desired key top forming portion, the key contact sheet 3 is partially curved. , The portion contacts the printed circuit board 5. As a result, a predetermined key wiring of the printed circuit board 5 is closed and a key signal is input.

FIG. 2 is a plan view of the key contact sheet 3.

The key contact sheet 3 is made of a film coated with a conductive thin film, and has a large number of key contacts 3a, 3a.

In the present embodiment, a structure is adopted in which a part of the key contact sheet 3 is extended and the extended portion 3b is brought into contact with the metal plate 7.

That is, as shown in FIG. 1, the metal plate 7 is exposed inside the outer frame in the thickness direction of the main body, the exposed metal plate 7 and the cabinet 6 are opposed to each other, and The extension 3b of the key contact sheet 3 is inserted and the elastic body 9 is further pushed in.

The above structure will be described in more detail.

FIG. 3 is a view in which a part of the metal plate 7 is exposed inside the outer frame, and the exposed metal plate 7 and the cabinet 6 are shown.
The extending portion 3b of the key contact sheet 3 is inserted into the gap facing the.

The state before inserting the extending portion 3b of the key contact sheet 3 is as shown in FIG. 4, and by bending the metal plate 7 near the outer frame, the metal plate 7 and the cabinet 6 are separated. A gap portion (hole portion) 10 is formed, and it is set so that the extension portion 3b of the key contact sheet 3 is located at the opening portion of the gap portion 10, and then the gap portion 10 is opened from above the opening portion. The elastic body 9 is pushed toward the inside of 10.

The elastic body 9 is slightly larger than the width of the gap portion 10, and the elastic force of the elastic body 9 causes the extending portion 3b to be extended.
Is urged in the lateral direction (direction perpendicular to the thickness direction).

As described above, the electronic device according to the present embodiment has the cabinet 6
A hole portion 10 exposing a metal plate 7 forming a part of an outer frame (cabinet) is provided on the inner surface of the key contact sheet 3 having a conductive thin film attached to the surface of the device attached to the hole portion 10 , And the elastic body 9 slightly larger than the hole 10 is pushed into the hole 10, so that the metal plate 7 and the conductive thin film of the key contact sheet 3 are easily brought into electrical contact. Can be stabilized.

FIG. 5 shows a block diagram of the electronic device of this embodiment. The same parts as those already mentioned are given the same reference numerals. A display element 11 displays input data and calculation data.

In the above-described embodiment, the conductive film of the key contact sheet 3 is applied and formed on the same surface as the key contact forming surface inside the key contact sheet 3, but the conductive film is the key contact sheet. When it is applied to the outside of No. 3, the structure is as shown in FIG. The reference numerals in the figure are equivalent to those already mentioned.

As is clear from the figure, the extension 3 of the key contact sheet 3 is formed.
B is folded and the elastic plate 9 is urged to bring the metal plate 7 into contact with the conductive film of the key contact sheet 3.

In the embodiment shown in FIGS. 1 and 6, a round bar rubber is suitable as the elastic body 9.

In the above-described two embodiments, it was necessary to bend the extending portion 3b of the key contact sheet 3, but if the labor for bending is omitted, the embodiment shown in FIGS. 7 to 9 is obtained. . In each drawing, the same reference numerals are given to the already-existing articles.

In the embodiment shown in FIG. 7, as the elastic body 12, a conductive round bar rubber is used.

In the embodiment shown in FIG. 8, a coil spring having conductivity is used as the elastic body 13.

In the embodiment of FIG. 9, a leaf spring having conductivity is used as the elastic body.

In the embodiment shown in FIGS. 7 to 9, the metal plate 7 is joined to the cabinet 6, but a part of the metal plate 7 is exposed in the thickness direction inside the main body.

In addition, in these three embodiments, the conductive thin film of the key contact sheet 3, the elastic bodies 12, 13, 14 and the metal plate 7 are used.
In order to connect the two locations with the elastic bodies 12, 13, 14 are required to have electrical conductivity.

<Effect> As described above, according to the electronic device of the present invention, due to the repulsive force that the elastic body tries to return to its original state, the electroconductivity of the film and the metal plate come into contact with each other, and stable electrical connection is obtained. Moreover, even if the connection is made by crimping, since the force is applied in the lateral direction of the body (direction perpendicular to the thickness direction), no force acts on the metal plate, the printed circuit board, and the attachment part of the cabinet, and these floating And peeling does not occur.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electronic device according to an embodiment of the present invention,
FIG. 2 is a plan view of the key contact sheet, FIG. 3 is a view showing an exposed structure of the metal plate, FIG. 4 is an explanatory view of a connecting process between the key contact sheet and the metal plate by an elastic body, and FIG. 6 is a partial sectional view of an electronic apparatus according to another embodiment of the present invention, FIG. 7 is a partial sectional view of an electronic apparatus according to yet another embodiment of the present invention, and FIG. FIG. 9 is a partial sectional view of an electronic device according to still another embodiment of the present invention, FIG. 9 is a partial sectional view of an electronic device according to still another embodiment of the present invention, and FIGS. It is a fragmentary sectional view of an electronic device. 1 ... Front film, 2 ... Back film, 3 ... Key contact sheet, 3b ... Extension part, 5 ... Printed circuit board, 6 ...
Cabinet, 7 ... Metal plate, 9, 12 ... Elastic body (round bar rubber), 10 ... Hole, 13 ... Elastic body (coil spring), 14 ... Elastic body (leaf spring).

Claims (4)

[Scope of utility model registration request] 1. An electronic device in which a key contact sheet, a key spacer, and a printed circuit board are provided between a front film and a back film to form an outer frame with the front film and the back film and a cabinet, and a metal plate, A recess is formed, the metal plate located inside the cabinet is exposed in the recess, one side surface of the recess is formed of the metal plate, and a part of the key contact sheet mounted on the cabinet is extended. An electronic device having a structure in which an extended portion that has been extended is bent in the concave portion, an elastic member is inserted into the concave portion, and the metal plate and the extended portion are pressed against each other. 2. The electronic device according to claim 1, wherein the elastic member is a round bar rubber. 3. The electronic device according to claim 1, wherein the elastic member is a coil spring. 4. The electronic device according to claim 1, wherein the elastic member is a leaf spring.